# The 34 largest environmental services companies in Illinois

Tamtam tracks 34 environmental services companies headquartered in Illinois. This list ranks all of them by number of employees on LinkedIn, led by Nalco Water, An Ecolab Company, Stericycle and HAVI. Their median headcount is 380. Half of them were founded in 1981 or later. The most common headquarters are Chicago (6), Hoffman Estates (3) and Naperville (2).

These Illinois-based companies focus on environmental services, ranging from water management to waste disposal and recycling. The list includes a mix of established large firms and mid-sized companies. Notable examples are Nalco Water, An Ecolab Company, a global leader in water and process management solutions, and Stericycle, which provides services for medical waste disposal. Other companies like Culligan International offer water filtration systems, while Crystal Clean specializes in environmentally sustainable waste disposal. Daniels Health provides medical waste management solutions, and LRS is a waste and recycling company.

A significant pattern observed is the concentration of headquarters in the Chicago metropolitan area, including Bannockburn, Rosemont, Hoffman Estates, and Naperville. This suggests a regional hub for environmental services within Illinois. The founding dates of these companies also span a wide range, from the Metropolitan Water Reclamation District of Greater Chicago, established in 1889, to several companies founded in the late 20th and early 21st centuries like LRS and Sims Lifecycle Services.

🇺🇸 Illinois · 34 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Nalco Water, An Ecolab Company](https://www.tamtam.ai/c/nalco-water-an-ecolab-company) (ecolab.com)<br>A global leader in water and process management solutions, leveraging connected chemistry and digital innovation to optimize sustainability and business outcomes | Chemical Manufacturing | 🇺🇸 Naperville | 12,751 |  |
| 2 | [Stericycle](https://www.tamtam.ai/c/stericycle) (linktr.ee)<br>A leading compliance company providing essential services for proper disposal of medical waste and confidential information, protecting client relationships and the environment | Hospitals and Health Care | 🇺🇸 Bannockburn | 6,777 |  |
| 3 | [HAVI](https://www.tamtam.ai/c/havi) (havi.com)<br>A global company providing sourcing, supply chain solutions, digital analytics, marketing services, and consumer products to connect people with their favorite products worldwide | Holding Companies | 🇺🇸 Chicago | 4,160 | 1974 |
| 4 | [Culligan International](https://www.tamtam.ai/c/culligan-international) (culliganinternational.com)<br>Provides advanced water filtration, softening, and treatment systems for homes and businesses through a vast global dealer network. | Consumer Services | 🇺🇸 Rosemont | 2,191 | 1936 |
| 5 | [Crystal Clean](https://www.tamtam.ai/c/crystal-clean) (crystal-clean.com)<br>A national leader in environmental services, HCC operates a network of branches across the US, focusing on environmentally sustainable waste disposal and recycling | Environmental Services | 🇺🇸 Hoffman Estates | 1,375 | 1999 |
| 6 | [Daniels Health](https://www.tamtam.ai/c/daniels-health) (danielshealth.com)<br>A global leader in healthcare innovation, providing safer solutions for medical waste management, with a focus on sustainability and staff safety | Hospitals and Health Care | 🇺🇸 Chicago | 1,064 | 1986 |
| 7 | [LRS](https://www.tamtam.ai/c/lrs) (lrsrecycles.com)<br>A leading waste and recycling company providing integrated services to millions of residential and commercial customers across ten states in North America | Waste Collection | 🇺🇸 Rosemont | 906 | 1999 |
| 8 | [Metropolitan Water Reclamation District of Greater Chicago](https://www.tamtam.ai/c/metropolitan-water-reclamation-district-of-greater-chicago) (mwrd.org)<br>Treating wastewater and managing stormwater to protect public health and the environment for Chicago and 128 suburban communities. | Utilities | 🇺🇸 Chicago | 906 | 1889 |
| 9 | [Sims Lifecycle Services](https://www.tamtam.ai/c/sims-lifecycle-services) (simslifecycle.com)<br>Specializing in managing retired electronic equipment and components, this company provides secure IT asset disposition and data center decommissioning services | IT Services and IT Consulting | 🇺🇸 West Chicago | 874 | 2002 |
| 10 | [City of Naperville](https://www.tamtam.ai/c/city-of-naperville) (naperville.il.us)<br>The company is located in Naperville, offering a variety of amenities such as top schools, a great library system, parks, and healthcare providers in a low-crime environment | Government Administration | 🇺🇸 Naperville | 616 | 1831 |
| 11 | [Clover Imaging Group](https://www.tamtam.ai/c/clover-imaging-group) (cloverimaging.com)<br>A leading company specializing in collecting and remanufacturing printer cartridges, offering environmentally friendly supplies that reduce printing costs and environmental impact | Retail Office Equipment | 🇺🇸 Hoffman Estates | 567 | 1996 |
| 12 | [ENTACT, LLC](https://www.tamtam.ai/c/entact-llc) (entact.com)<br>Specializing in environmental remediation, geotechnical infrastructure, and ground improvement projects, this company provides cost-effective, high-quality solutions with a focus on safety and innovation | Environmental Services | 🇺🇸 Westmont | 525 | 1991 |
| 13 | [V3 Companies](https://www.tamtam.ai/c/v3-companies) (v3co.com)<br>An employee-focused organization that prioritizes career development and community service, offering meaningful and rewarding opportunities for growth and leadership | Civil Engineering | 🇺🇸 Woodridge | 518 | 1983 |
| 14 | [UCC Environmental](https://www.tamtam.ai/c/ucc-environmental) (uccenvironmental.com)<br>Global leader in environmental solutions for solids handling, wastewater treatment, and pollution control in power generation and heavy industrial markets since 1920 | Environmental Services | 🇺🇸 Waukegan | 433 | 1920 |
| 15 | [SET Environmental, Inc.](https://www.tamtam.ai/c/set-environmental-inc) (setenv.com)<br>SET Environmental provides nationwide environmental management services with a focus on integrity, innovation, and excellence to address clients' unique hazardous concerns | Environmental Services | 🇺🇸 Wheeling | 416 | 1979 |
| 16 | [Baxter & Woodman](https://www.tamtam.ai/c/baxter-and-woodman) (baxterwoodman.com)<br>A consulting engineering and technology firm providing sustainable solutions to municipalities and government agencies in multiple states, with a focus on community value | Civil Engineering | 🇺🇸 Crystal Lake | 392 | 1946 |
| 17 | [Weaver Consultants Group](https://www.tamtam.ai/c/weaver-consultants-group) (wcgrp.com)<br>A customer-focused consulting firm providing project management, regulatory compliance, and business solutions to clients across the United States since 1991 | Environmental Services | 🇺🇸 Chicago | 380 | 1991 |
| 18 | [City of Joliet](https://www.tamtam.ai/c/city-of-joliet) (joliet.gov)<br>A vibrant city in Illinois, home to 150,000 residents, thriving businesses, and attractions County seat of Will County Located 40 miles southwest of Chicago | Government Administration | 🇺🇸 Joliet | 379 | 1852 |
| 19 | [Utilities Inc.](https://www.tamtam.ai/c/utilities-inc) (uiwater.com)<br>Corix companies provide sustainable water, wastewater, and energy utility infrastructure solutions to enhance life and promote thriving communities in North America | Utilities | 🇺🇸 Chicago | 373 | 1965 |
| 20 | [Pharma Logistics](https://www.tamtam.ai/c/pharma-logistics) (pharmalogistics.com)<br>A leading provider of pharmaceutical reverse distribution services, helping healthcare organizations remove expired inventory, reduce risk, and lower healthcare costs | Pharmaceutical Manufacturing | 🇺🇸 Libertyville | 329 | 1996 |
| 21 | [Culligan By WaterCo](https://www.tamtam.ai/c/culligan-by-waterco) (culligan.com)<br>A leader in water treatment systems for residential, commercial, and industrial use with over 80 years of experience and global presence | Manufacturing | 🇺🇸 Lombard | 326 | 2011 |
| 22 | [City of Springfield Illinois](https://www.tamtam.ai/c/city-of-springfield-illinois) (springfield.il.us)<br>A local government in Springfield, Illinois, known for its rich history, strong business environment, and diverse city departments serving residents and businesses | Government Administration | 🇺🇸 Springfield | 319 | 1840 |
| 23 | [Mahoney Environmental](https://www.tamtam.ai/c/mahoney-environmental) (mahoneyes.com)<br>Leader in recycling Used Cooking Oil for restaurants nationwide, offering innovative solutions for oil collection and facility maintenance to optimize operations | Environmental Services | 🇺🇸 Woodridge | 307 | 1953 |
| 24 | [Mr. Bult's, Inc.](https://www.tamtam.ai/c/mr-bult-s-inc) (mrbults.com)<br>A leading provider of long-haul waste transportation services with a vast fleet of equipment, nationwide service footprint, and tailored solutions for reducing costs | Truck Transportation | 🇺🇸 Burnham | 249 | 1980 |
| 25 | [RainSoft – A division of Aquion, Inc.](https://www.tamtam.ai/c/rainsoft-a-division-of-aquion-inc) (rainsoftdealer.com)<br>A company since 1953 providing whole-house water treatment systems, training, support, and exclusive sales territories with no franchise fees | Consumer Services | 🇺🇸 Roselle | 240 | 1953 |
| 26 | [City of Des Plaines](https://www.tamtam.ai/c/city-of-des-plaines) (desplainesil.gov)<br>The company provides residents and businesses in Des Plaines, IL with access to transportation, amenities, and a vibrant community | Government Administration | 🇺🇸 Des Plaines | 225 |  |
| 27 | [Duke's](https://www.tamtam.ai/c/duke-s) (dukes.com)<br>Provider of environmental services for underground infrastructure maintenance, trusted by municipalities and customers for over 75 years Team uses technology and experience for long-term asset preservation | Environmental Services | 🇺🇸 Elgin | 214 | 1948 |
| 28 | [Fuel Tech, Inc.](https://www.tamtam.ai/c/fuel-tech-inc) (ftek.com)<br>Fuel Tech provides cost-effective and sustainable multi-pollutant emissions control technologies and water treatment solutions including NOx reduction systems and dissolved oxygen infusion technology | Environmental Services | 🇺🇸 Warrenville | 185 | 1981 |
| 29 | [Carus](https://www.tamtam.ai/c/carus) (carusllc.com)<br>A family-owned company based in Illinois, focused on producing products to clean air, water, and soil for a sustainable future | Chemical Manufacturing | 🇺🇸 Peru | 183 | 1915 |
| 30 | [Clover Wireless](https://www.tamtam.ai/c/clover-wireless) (reconext.com)<br>Global leader in cost-effective supply chain solutions for wireless industry, offering repair, reclamation, trade-in, and buyback programs to maximize value and minimize waste | Wireless Services | 🇺🇸 Hoffman Estates | 183 |  |
| 31 | [Tradewater](https://www.tamtam.ai/c/tradewater) (tradewater.co)<br>A mission-driven B Corp specializing in reducing greenhouse gas emissions by developing high-value projects and creating top-quality carbon offset credits | Environmental Services | 🇺🇸 Chicago | 82 | 2016 |
| 32 | [GROUPE ASTRADEC ENVIRONNEMENT](https://www.tamtam.ai/c/groupe-astradec-environnement) (astradec-environnement.fr)<br>Collects and treats all types of waste. Offers comprehensive waste management solutions for various industries. Environmentally responsible approach. | Waste Treatment and Disposal | 🇺🇸 Arques | 80 | 1988 |
| 33 | [Full Circle Electronics - formerly Sipi Asset Recovery](https://www.tamtam.ai/c/full-circle-electronics-formerly-sipi-asset-recovery) (fullcircleelectronics.com)<br>End-to-end electronics recycling solutions provider with locations in the US, Mexico, and Colombia Specializes in secure, environmentally compliant IT asset decommissioning | IT Services and IT Consulting | 🇺🇸 Elk Grove Village | 72 | 2001 |
| 34 | [BESI USA](https://www.tamtam.ai/c/besi-usa) (besiusa.com)<br>A woman-owned company specializing in developing, designing, and deploying innovative renewable energy technologies for various industries and projects worldwide | Research Services | 🇺🇸 University Park | 9 | 2007 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

## More company lists in Illinois

- [The largest companies in Illinois](https://www.tamtam.ai/l/largest-companies-illinois) (4,687)
- [Multinational companies in Illinois](https://www.tamtam.ai/l/multinational-companies-illinois) (831)
- [Manufacturers in Illinois](https://www.tamtam.ai/l/manufacturers-illinois) (528)
- [Education providers in Illinois](https://www.tamtam.ai/l/education-companies-illinois) (370)
- [Financial services firms in Illinois](https://www.tamtam.ai/l/financial-services-firms-illinois) (352)
- [Professional services firms in Illinois](https://www.tamtam.ai/l/professional-services-firms-illinois) (339)
- [Companies with in-house R&D in Illinois](https://www.tamtam.ai/l/r-and-d-companies-illinois) (322)
- [Hardware manufacturers in Illinois](https://www.tamtam.ai/l/hardware-companies-illinois) (296)
- [IT Services and IT Consulting companies in Illinois](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-illinois) (294)
- [Hospitals and Health Care companies in Illinois](https://www.tamtam.ai/l/hospitals-and-health-care-companies-illinois) (280)
- [IT services companies in Illinois](https://www.tamtam.ai/l/it-services-companies-illinois) (274)
- [Healthcare providers in Illinois](https://www.tamtam.ai/l/healthcare-providers-illinois) (262)
- [Retail chains in Illinois](https://www.tamtam.ai/l/retail-chains-illinois) (260)
- [Financial Services companies in Illinois](https://www.tamtam.ai/l/financial-services-companies-illinois) (248)
- [Critical infrastructure operators in Illinois](https://www.tamtam.ai/l/critical-infrastructure-operators-illinois) (241)
- [Consulting firms in Illinois](https://www.tamtam.ai/l/consulting-firms-illinois) (238)
- [Logistics companies in Illinois](https://www.tamtam.ai/l/logistics-companies-illinois) (228)
- [Transportation, Logistics, Supply Chain and Storage companies in Illinois](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-illinois) (215)
- [SaaS companies in Illinois](https://www.tamtam.ai/l/saas-companies-illinois) (182)
- [Companies with a mobile app in Illinois](https://www.tamtam.ai/l/companies-with-mobile-app-illinois) (178)
- [Family-owned companies in Illinois](https://www.tamtam.ai/l/family-owned-companies-illinois) (166)
- [Subscription businesses in Illinois](https://www.tamtam.ai/l/subscription-businesses-illinois) (160)
- [Corporate groups and holding companies in Illinois](https://www.tamtam.ai/l/holding-companies-illinois) (154)
- [Publicly traded companies in Illinois](https://www.tamtam.ai/l/publicly-traded-companies-illinois) (154)

## The same list elsewhere in United States

- [Environmental services companies in Texas](https://www.tamtam.ai/l/environmental-services-companies-texas) (98)
- [Environmental services companies in California](https://www.tamtam.ai/l/environmental-services-companies-california-united-states) (95)
- [Environmental services companies in Florida](https://www.tamtam.ai/l/environmental-services-companies-florida) (58)
- [Environmental services companies in New York State](https://www.tamtam.ai/l/environmental-services-companies-new-york-state-united-states) (39)
- [Environmental services companies in North Carolina](https://www.tamtam.ai/l/environmental-services-companies-north-carolina) (37)
- [Environmental services companies in Pennsylvania](https://www.tamtam.ai/l/environmental-services-companies-pennsylvania) (35)
- [Environmental services companies in Washington State](https://www.tamtam.ai/l/environmental-services-companies-washington-state) (29)
- [Environmental services companies in Ohio](https://www.tamtam.ai/l/environmental-services-companies-ohio) (26)
- [Environmental services companies in Alabama](https://www.tamtam.ai/l/environmental-services-companies-alabama) (25)

## The same list elsewhere

- [Environmental services companies in the world](https://www.tamtam.ai/l/environmental-services-companies-in-the-world) (4,213)
- [Environmental services companies in North America](https://www.tamtam.ai/l/environmental-services-companies-in-north-america) (1,043)

---

Source: https://www.tamtam.ai/l/environmental-services-companies-illinois